package cn.vconinfo.base.http;

import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class HttpClientConUtils {

    public static String doGet(String httpurl) {
        HttpURLConnection connection = null;
        InputStream is = null;
        BufferedReader br = null;
        String result = null;// 返回结果字符串
        try {
            // 创建远程url连接对象
            URL url = new URL(httpurl);
            // 通过远程url连接对象打开一个连接，强转成httpURLConnection类
            connection = (HttpURLConnection) url.openConnection();
            // 设置连接方式：get
            connection.setRequestMethod("GET");
            // 设置连接主机服务器的超时时间：15000毫秒
            connection.setConnectTimeout(15000);
            // 设置读取远程返回的数据时间：60000毫秒
            connection.setReadTimeout(600000);
            // 发送请求
            connection.connect();
            // 通过connection连接，获取输入流
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                // 封装输入流is，并指定字符集
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                // 存放数据
                StringBuffer sbf = new StringBuffer();
                String temp = null;
                while ((temp = br.readLine()) != null) {
                    sbf.append(temp);
                    sbf.append("\r\n");
                }
                result = sbf.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            connection.disconnect();// 关闭远程连接
        }

        return result;
    }

    public static String doPost(String httpUrl, String param) {

        HttpURLConnection connection = null;
        InputStream is = null;
//        OutputStream os = null;
        OutputStreamWriter os = null;
        BufferedReader br = null;
        String result = null;
        try {
            URL url = new URL(httpUrl);
            // 通过远程url连接对象打开连接
            connection = (HttpURLConnection) url.openConnection();
            // 设置连接请求方式
            connection.setRequestMethod("POST");
            // 设置连接主机服务器超时时间：15000毫秒
            connection.setConnectTimeout(30000);
            // 设置读取主机服务器返回数据超时时间：60000毫秒
            connection.setReadTimeout(2000000);

            // 默认值为：false，当向远程服务器传送数据/写数据时，需要设置为true
            connection.setDoOutput(true);
            // 默认值为：true，当前向远程服务读取数据时，设置为true，该参数可有可无
            connection.setDoInput(true);
            // 设置传入参数的格式:请求参数应该是 name1=value1&name2=value2 的形式。
            connection.setRequestProperty("Content-Type", "application/json;charset=utf-8");
            // 设置鉴权信息：Authorization: Bearer da3efcbf-0845-4fe3-8aba-ee040be542c0
//            connection.setRequestProperty("Authorization", "Bearer da3efcbf-0845-4fe3-8aba-ee040be542c0");
            // 通过连接对象获取一个输出流
//            os = connection.getOutputStream();
            os = new OutputStreamWriter(connection.getOutputStream(), "UTF-8");
            os.write(param);
            // 通过输出流对象将参数写出去/传输出去,它是通过字节数组写出的
//            os.write(param.getBytes());
            os.flush();
            // 通过连接对象获取一个输入流，向远程读取
            if (connection.getResponseCode() == 200) {

                is = connection.getInputStream();
                // 对输入流对象进行包装:charset根据工作项目组的要求来设置
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));

                StringBuffer sbf = new StringBuffer();
                String temp = null;
                // 循环遍历一行一行读取数据
                while ((temp = br.readLine()) != null) {
                    sbf.append(temp);
                    sbf.append("\r\n");
                }
                result = sbf.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            // 断开与远程地址url的连接
            connection.disconnect();
        }
        return result;
    }

    /**
     *  设置跨域操作
     *
     * @param httpResp
     * @param req
     */
    public static void setOriginHeader(HttpServletResponse httpResp, HttpServletRequest req) {
        String originHeader= req.getHeader("Origin");
//        if (GenerateConstants.allowedOrigins.contains(originHeader)){
            httpResp.setHeader("Access-Control-Allow-Origin", originHeader);
            httpResp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            httpResp.setHeader("Access-Control-Max-Age", "3600");
            httpResp.setHeader("Access-Control-Allow-Headers", "Content-Type,Access-Token");
            // 如果要把Cookie发到服务器，需要指定Access-Control-Allow-Credentials字段为true
            httpResp.setHeader("Access-Control-Allow-Credentials", "true");
            httpResp.setHeader("Access-Control-Expose-Headers", "*");
//        }
    }

    /**
     * 根据http的get请求的URL地址，获取地址上面的请求参数
     *
     * @param httpGetUrl
     * @return
     * @throws MalformedURLException
     */
    public static Map<String, String> getHttpGetParam(String httpGetUrl) throws MalformedURLException {
        URL url = new URL(httpGetUrl);
        String urlQuery = url.getQuery();
        if(StringUtils.isNotBlank(urlQuery)){
            return form2Map(urlQuery);
        }
        return Collections.emptyMap();
    }

    /**
     * 表单字符串转化成 hashMap
     *
     * @param orderinfo
     * @return
     */
    public static HashMap<String, String> form2Map(String httpParam) {
        String listinfo[];
        HashMap<String, String> map = new HashMap<String, String>();
        listinfo = httpParam.split("&");
        for(String s : listinfo)
        {
            String list[]  = s.split("=");
            if(list.length>1)
            {
                map.put(list[0], list[1]);
            }
        }
        return map;
    }

    /**
     * hashMap 转化成表单字符串
     * @param map
     * @return
     */
    public static String map2Form(Map<String, String> map) {
        StringBuilder stringBuilder = new StringBuilder();
        if (map == null || map.size() == 0) {
            return stringBuilder.toString();
        } else {
            for (Map.Entry<String, String> entry : map.entrySet()) {
                stringBuilder.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
            }
            return stringBuilder.substring(0, stringBuilder.length() - 1);
        }
    }

}